Thermal generator using magnetocaloric material

• US 8,769,966 B2
• Filed: 08/09/2010
• Issued: 07/08/2014
• Est. Priority Date: 08/09/2010
• Status: Active Grant

• Current Assignee: France Brevets SAS
• Original Assignee: Cooltech Applications S.A.S.
• Inventors: Heitzler, Jean-Claude, Muller, Christian
• Primary Examiner(s): Ciric, Ljiljana
• Assistant Examiner(s): COX, ALEXIS K
• Application Number:
  US12/852,671
• Publication Number:
  US 20120031107A1
• Time in Patent Office: 1,429 Days
• Field of Search: 62/31, 62/37, 624/47
• US Class Current: 62/3.1
• CPC Class Codes: F25B 21/00 Machines, plants or systems, using electric or magnetic effects
• CPC Class Codes: F25B 2321/002 by using magneto-caloric effects
• CPC Class Codes: Y02B 30/00 Energy efficient heating, ventilation or air conditioning [HVAC]

Abstract

A thermal generator (100) with at least one thermal module (110) comprising at least two magnetocaloric elements (111, 112). The thermal generator is characterized in that it comprises at least two magnetic assemblies (131, 132) in which one magnetic assembly (131, 132) subjects at least one magnetocaloric element (111, 112) of the thermal module (110) to alternate magnetic phases. The thermal generator is further characterized in that it comprises a thermally insulating body insulating the magnetic assemblies (131, 132) from each other and forming thermally insulated cells (141, 142) comprising one magnetic assembly (131, 132) and its corresponding magnetocaloric elements (111, 112).

Claims

1. A thermal generator having

a heat transfer fluid which flows through the thermal generator,

at least a first thermal module comprising at least a first magnetocaloric element and a second magnetocaloric element,

wherein the first magnetocaloric element has a first fluid passage and the second magnetocaloric element has a second fluid passage,

wherein the first magnetocaloric element and the second magnetocaloric element are fluidly connected by the heat transfer fluid flowing through the first and second fluid passages,

wherein the thermal generator comprises at least a first magnetic assembly and a second magnetic assembly, in which the first magnetic assembly subjects at least the first magnetocaloric element of said thermal module to alternating magnetic phases, and

the thermal generator comprises a thermally insulating body insulating the first magnetic assembly and second magnetic assembly from each other, the thermally insulating body forming a first thermally insulated cell and a second thermally insulated cell, the first thermally insulated cell comprising the first magnetic assembly and at least the first magnetocaloric element,

the second thermally insulated cell comprising the second magnetic assembly and at least the second magnetocaloric element.

2. The thermal generator, according to claim 1, wherein for said at least one thermal module, one magnetic assembly is assigned to one magnetocaloric element.

3. The thermal generator of claim 1, wherein the thermal generator comprises a second thermal module, the second thermal module having at least a third magnetocaloric element and a fourth magnetocaloric element,

wherein the third magnetocaloric element has a third fluid passage and the fourth magnetocaloric element has a fourth fluid passage,

the third magnetocaloric element being arranged in the first thermally insulated cell,

wherein the first magnetic assembly subjects both the first magnetocaloric element of the first thermal module and the third magnetocaloric element of the second thermal module to alternating magnetic phases.

4. The thermal generator according to claim 1, wherein the insulating body is realized by a layer of at least one thermal insulating material disposed around each magnetic assembly and the at least one magnetocaloric element which the magnetic assembly subjects to a magnetic field.

5. The thermal generator according to claim 1, wherein the insulating body is fixed to the magnetic assemblies.

6. The thermal generator according to claim 1, wherein a layer of thermal insulating material is disposed between each magnetic assembly (131, 132) and the at least one magnetocaloric element which the magnetic assembly subjects to a magnetic field.

7. The thermal generator according to claim 1, wherein motion of the at least two magnetic assemblies with respect to the at least one magnetocaloric element of subjects the at least one magnetocaloric element to alternating magnetic phases.

8. The thermal generator according to claim 1, wherein an operating temperature for at least one of the at least two magnetocaloric elements is at or above negative ten degrees Celsius (−

10°

C.).

9. The thermal generator according to claim 1, wherein a operating temperature for each of the at least two magnetocaloric elements is at or above negative ten degrees Celsius (−

10°

C.).

10. The thermal generator according to claim 1, wherein a heat transfer fluid flows through the at least one thermal module in alternating and opposite directions, in sync with the alternating magnetic phases.

11. The thermal generator according to claim 1, wherein said thermally insulated cells are air tight enclosures.

12. The thermal generator according to claim 11, wherein said thermally insulated cells are under vacuum.

13. The thermal generator according to claim 11, wherein said insulated cells are filled with a gas or a mix of different gasses, the gas or mix of different gasses having a low thermal conductivity.

14. The thermal generator according to claim 13, wherein said gas or mix of different gasses contained in said insulated cells is at atmospheric pressure.

15. The thermal generator according to claim 13, wherein said gas or mix of different gasses contained in said insulated cells is pressurized.